Hi
The photo isn't that helpful, but it looks to be a Chester assayed piece, probably 1897, and probably Sterling Silver. The maker's mark looks suspiciously like that of Joseph Rodgers & Sons - please see a brief history below;
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Joseph Rodgers & Sons Ltd.
Marks used:- I.R, JR (with addition of star and Maltese cross trademarks)
Starting life in 1724 (although other sources suggest 1682), Joseph Rodgers & Sons are one of the longest established cutlery companies in Sheffield. They were granted the Royal warrant in 1821 by George IV, this accolade continuing through the reign of Queen Victoria and they proudly display their "by appointment" on knife blades. They produced a large amount of silver and plated flatware, but are particularly well known for the fine quality of their knives and carving sets.
Joseph Rodgers & Sons were taken over in 1975, but their name and trademarks are still used.
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This information comes from this website -
http://www.antiquesilverspoons.co.uk/canteenmakers.htm" onclick="window.open(this.href);return false; - and they have example photos. Try and compare the marks. Oh, and ignore the fact that they were in Chester - a great of silver from other cities was assayed in Chester because the wait was shorter.
Waylander